\documentclass{article}
\usepackage{mathptmx}
\begin{document}
\title{Test of BibTeX}
\date{}
\maketitle



In \cite{kirkpatrick83optimization}, the author \ldots

\cite{harel87statecharts,ousterhout94tcl,jacobson88congestion}         did some work on \ldots
         

\bibliographystyle{plain}

\bibliography{bib_test}
      

\end{document}
